<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <ul>
            <li v-for="(item,index) in list">{{item}} <button @click="del(index)">删除</button></li>
        </ul>
        <button @click="add">生成</button>
    </div>
    <script src="./vue.js"></script>
    <script>
       
        const app = new Vue({
            el: '#app',
            data: {
                list: [1,2,3],
            },
            methods: {
                
                add() {
             
                    this.list.push( Math.floor(Math.random() * 20))
                },
                del(index) {
                    this.list.splice(index,1)
                }
            }

        })


    </script>

</body>

</html>